Why in the world would you multiply out an expression that was already factored and then factor it again?
In any case, the whole point was not to find the x for which y= 0 but the fact that y can be 0 which should have been obvious.

0 = 4 - x

-4 = -x

-4/-1 = x

4 = x

This is where the point (4, 0) comes from indicating that the smallest possible y value is 0, right?

ok.....

Originally Posted by HallsofIvy

Why in the world would you multiply out an expression that was already factored and then factor it again?
In any case, the whole point was not to find the x for which y= 0 but the fact that y can be 0 which should have been obvious.